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The subject of research in the article are energy regulators of radial fans. The purpose of the article is improving of the adaptability and efficiency radial fans by optimizing the parameters of the energy regulator based on the developed mathematical model. The idea of this work is to use the power of control flow of high-pressure cavity of the fan case in order to change the angular momentum of the main stream at the inlet of the impeller. Methodologically the work uses: the similarity theory, physical modeling and experimental design. On a specially designed aerodynamic stand with vortex chamber authors experimentally obtained aerodynamic characteristics of a low-channel and vaneless energy regulators. According to the obtained values of the factors determining the efficiency of energy regulators for a discrete number of values of the pressure coefficients of control flow authors produced the optimal interpolation values of its parameters using the least squares method. They also carried out an analysis of the influence of the energy characteristics of the flow control on the efficiency of the energy regulator. As a result of full-scale experimental studies one can use obtained formulas to calculate the values of the geometric parameters of energy regulators, and test fan of ВРВП series with the energy regulator. These formulas has also allowed to develop an engineering design technique for power control and set up their standard series for the main ventilation fans, performed on the aerodynamic configuration Ц70-20, Ц76-16, Ц76-12 and Ц70-15. Compared to axial guide vanes, energy regulators allow increasing the depth of the economic regulation of the centrifugal fan by 26 %.

Mathematical model of energy regulator of radial fan